The Opsera is a statistic RealGM Executive Editor Chris Reina created in order to objectively rank teams by how well they hit (OPS) and pitch (ERA). 

In order to determine the Opsera rating for each, we take their OPS, multiply that number by 10 to move the decimal point over one place to the right and then subtract their ERA from that number.  

All statistics are through Monday, July 29th

Rankings from last week are in parenthesizes.

1. (3) Detroit Tigers – 4.09

The Tigers went 3-1 last week without Miguel Cabrera.

2. (1) St. Louis Cardinals – 4.02

Only three clubs have fewer home runs than the Cardinals, who are one of baseball's best all-around teams.

3. (2) Boston Red Sox – 4.00

Boston lost three of four to Tampa Bay, falling out of first place in the process.

4. (4) Atlanta Braves – 3.97

Chipper who? Chris Johnson leads the NL in batting average -- .339/.377/.470.

T5. (5) Pittsburgh Pirates – 3.92

Pedro Alvarez has hit a league-leading 27 home runs, bringing the Pirates to within a win of first place.

-- (6) Cincinnati Reds – 3.92

7. (7) Tampa Bay Rays – 3.76

8. (9) Los Angeles Dodgers – 3.71

9. (10) Oakland Athletics – 3.57

10. (8) Texas Rangers – 3.56

11. (T15) Cleveland Indians – 3.40

12. (14) Arizona Diamondbacks – 3.36

13. (12) Colorado Rockies – 3.32

14. (11) Baltimore Orioles – 3.28

15. (T15) Washington Nationals – 3.21

16. (13) Los Angeles Angels – 3.18

T17. (22) Kansas City Royals – 3.17

-- (T15) Chicago Cubs – 3.17

19. (18) Milwaukee Brewers – 3.08

20. (21) Toronto Blue Jays – 3.04

21. (20) New York Yankees – 3.03

22. (T23) New York Mets – 3.00

23. (T23) Seattle Mariners – 2.94

24. (26) Chicago White Sox – 2.86

25. (25) San Francisco Giants – 2.84

26. (19) Philadelphia Phillies – 2.82

27. (27) San Diego Padres – 2.71

28. (28) Minnesota Twins – 2.63

29. (29) Miami Marlins – 2.52

30. (30) Houston Astros – 1.76